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n in (-oo:+oo)
4-(5*n) = 2*n+39 // - 2*n+39
4-(5*n)-(2*n)-39 = 0
4-5*n-2*n-39 = 0
-7*n-35 = 0 // + 35
-7*n = 35 // : -7
n = 35/(-7)
n = -5
n = -5
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